Your other choice is to buy a used or refurbished Mac that supports Mac OS 9, with Mac OS 9 pre-installed*:
http://www.macmaps.com/usedrefurbished.html
Note, only 2002 and earlier Macs can guarantee booting into Mac OS 9. The only exception being the non-Firewire 800 PowerMac G4 whose rear lacks the Firewire 800 port shown here:

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- * Links to my pages may give me compensation.